plot nonlinear system with constant input

I want ask about how I plot nonlinear system with constant input, I have sample but using sinusoidal input,this is a sample :

Function u=finp(t)
A=1
w=2
u=A*sin(w*t)
function  dx=sys2(t,x)
m=1;b=5;k=3;
%evaluate the external function %value for a given value of t
u=feval(‘finp’,t)
%to make dh a column vector
dx = zeros(2,1); 
%computing derivatives
dx(1)=x(2);
dx(2)= u -(k/m)*x(1)-(b/m)*x(2);

>>[t,x]=ode45(@sys2,[0 10],[5 0]);
for i=1:length(t),u(i)=feval(‘finp’,t(i)); end
>> plot(t,u,t,x)

if my input just constant like 0.01,how I must running the program?thank you.

[Walter Roberson]

Which variable do you consider your "input" for this purpose?